Margaret Livingston Hill was Isabella's grand-niece and the daughter of Grace Livingston Hill and Rev. T.G.F. Hill. She was born in 1893, just after her parents began serving at Wakefield Presbyterian Church near Philadelphia.
Margaret became an accomplished musician and with her sister, Ruth, founded the Swarthmore School of Music. She studied piano with Ernest Hutcheson and Pipe-organ and Theory with Ralph Kinder, after whose teaching she earned the degree of Associate of the American Guild of Organists. Margaret was the Director of the School and taught Advanced Piano and Theory, as well as Teacher Training.
She was also a writer and published three children's books as Margaret Livingston Hill. She married Rev. Wendall Walker in 1924 and they lived with Grace for a time. They had two children, Allyn and Marcia. The Walkers later moved to Kentucky and founded the Warfield Bible Institute.